I spent way too much time on Vi Hart’s YouTube channel last year. Her hexaflexagons intrigued me. I decided to see if I could harness the power of 18 equilateral triangles in a fun little package to help my students with some key concepts.

First came my slope hexaflexagon.

Then cameĀ transformations.

My precalculus students also got in on the action with Trig Hexaflexagons.

Download a copy and have some fun!

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